import java.util.*;
class App {
private final String first, last;

public App(String first, String last) {
this.first = first;
this.last = last;
}

public boolean equals(Object o) {
if ( !(o instanceof App))
return false;
App n = (App)o;
return n.first.equals(first) && n.last.equals(last);
}

public String toString() {
return first + ", " + last;
}

static public void main(String [] args) {
Set<App> s = new HashSet<App>();
s.add(new App("A", "B"));
System.out.println(s.contains(new App("A", "B")));
}
}